“Which rocker ratio should I use?”

Most engine/cylinder head combinations will respond to higher rocker ratios especially on the intake valve. When installing higher ratio rockers, the engine ‘sees’ more valve lift and a faster valve opening and closing rate.

Remember, the engine responds to valve movement not lifter movement.

Any change in the valve train that increases valve movement will increase power. i.e., camshaft, rocker ratio or stiffer pushrods.

When installing higher ratio rockers the remainder of the valve train must be checked for clearance.

Items to check are:

  1. valve spring travel (coil bind)
  2. retainer to seal clearance
  3. pushrod to head clearance
  4. pushrod length
  5. and in some cases piston to valve clearance.